The thing about grout is that once you start there is no stopping. Even two hours into it when you don't think that you can hold your arm up anymore there is no break because there is a time limit. Once the grout hardens it better be where you want it to be. I tried something new, it was a sealer that got added to the grout instead of water. It had very specific instructions on not adding more liquid but the bottle didn't have enough liquid for the grout mix. The thicker grout is mixed the more difficult it is to get it in the gaps between the tiles. All that is past now and there are only a few minor problems that will get fixed by the matching caulk that came with it.